\\[-1.8ex] Soil Heterogeneity & $-$0.086$^{***}$ & $-$0.074$^{**}$ & $-$0.080$^{***}$ & $-$0.084$^{***}$ & $-$0.088$^{***}$ & $-$0.088$^{***}$ & $-$0.089$^{***}$ \\ 
  & (0.032) & (0.030) & (0.031) & (0.031) & (0.032) & (0.033) & (0.034) \\ 
\\[-1.8ex]
Observations & 23,443 & 23,443 & 23,443 & 23,443 & 23,443 & 23,443 & 23,443 \\ 
R$^{2}$ & 0.377 & 0.376 & 0.377 & 0.377 & 0.377 & 0.377 & 0.377 \\ 
